The Tensile Force Test Model of Vertical Prestressing Finishing Rolling Rebar in Box Girder

Abstract:

Vertical prestressing tendons finishing twisted steel is widely used in the concrete box girder, but ,it is hard to effectively control the loss of anchor stress. Based on the dynamic, the three-parameter model was built which include the frequency of the exposed segmentthe segment length of the exposed steel reinforcements and effective tensile force. The vertical tensioning force of the box girder webs model was designed at laboratory .The natural frequency was obtained through test. Relying on experimental test data ,the model of the nonlinear relationship between fine bundle the rebar tensile force and the exposed segment frequency was established. Here in NDT methods to be able to quickly and effectively measured vertical prestressing tension.

• Periodical: Applied Mechanics and Materials (Volumes 501-504)
• Pages: 1287-1291
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.501-504.1287
• Online since: January 2014
• Authors: Xiang Feng Xu
• Keywords: Box Girder, Finishing Twisted Steel, Frequency, Model Test, Rayleigh Law, Vertical Prestressing

References

[1] Fang Zhi, Wang Jian. Vertical prestressing loss in the box girder of long-span PC continuous bridges [J]. China civil engineering journal, 2006, 39(5): 78-84.

[2] Liu Xuewei, Zhong Xingu, Shen Mingyan. Indoor model test research on stress loss of vertical prestressing reinforcement [J]. Journal of China & Foreign Highway, 2008, 28(5): 196-198.

[3] Shao Xudong, Li Bin, Zeng Tiansheng etc. Calculation and Measure of Web Vertical Stress Field Using Low Retracting Prestressed Anchorage[J]. Journal of Highway and Transportation Research and Development, 2009, 26(9): 91-96.

[4] Shen Mingyan, Zhong Xingu, Liu Xuewei. Experiment study on the loss of vertical prestress in the webs of concrete box girder[J]. Engineering Mechanics, 2010, 27(9): 168-174.

[5] Deng Zhiheng，Luo Zhijia，Lin Jun. Analysis of Diagonal cracks in box girder web effected by vertical prestressed loss. Highway Engineering, 2007, 32(6): 19-22.

[6] Ministry of Communications of the People's Republic of China. JTGD62-2004, Code for Design of Highway Reinfored Concrete and Prestressed Concrete Bridges and Culverts[S]. People's Communications Press，(2004).

[7] Zhong Xingu, Yang Tao, Shen Mingyan, etc. Method for Tension Test of Vertical Prestressing Bars in Webs of Concrete Box Girder Bridges[J]. China Journal of Highway and Transport, 2010, 23(4): 63-69.

DOI: 10.1061/(asce)be.1943-5592.0000164

[8] Yang Tao, Zhong Xingu, Shen Mingyan. Test for frequency properties of uncased part of vertical tendon in webs of a prestressed concrete box girder bridge[J]. Journal of Vibration and Shock, 2011, 30(12): 201-204.

[9] Clough. R, Penzine.J. Dynamics of Structures[M]. Wang Guangyuan. Beijing: Higher Education Press 2006, 120-129.